Reciprocating drill



i 2 Sheets-Sheet 2.

. (N0 Model.) V

A. E. W. MEISSNER.

REGIPROGATING DRILL.

No. 553,534. Patented Jan. 28, 1896.

NlTED STATES PATENT FFICE.

ADOLF EMIL ,VALDEMAR MElSSNER, OF CHARLOTTENBURG, GERMANY, AS-

SIGNOR T 0 THE SIEMENS & HALSKE ELECTRIC COMPANY AMERICA,

OF CHICAGO, ILLINOIS.

RECIPROCATING DRILL.

SPECIFICATION forming part of Letters Patent N0. 553,534, dated January 28, 1896.

Application filed August 15, 1895. Serial No. 559,844. (No model.) Patented in Belgium March 15, 1894, No. 108,701; in Italy March 21,1894,N0.35,821; in France May 4, 1894, No. 286,250; in Germany May 29, 1894,1T0. 76,660; in South African Republic June 19, 1894,1To. 654; in England November 17, 1894, No. 650 in Norway November 30, 1894,11). 3,592,

and in Sweden January 24, 1895,1T0. 5,786.

T 0 all whom it may concern.-

Be' it known that I, ADOLF EMIL WALDE- MAR MEIssNER, a subject of the Emperor of Germany, residing at Oharlottenburg, near Berlin, Germany, have invented new and useful Improvements in Reciprocating Drills, (Case No. 641,) of which the following is a specification, and for which Letters Patenthave been granted in Germany, No. 76,660, dated May 29, 1894; in France, No. 236,250, dated May 4,1894; in Great Britain, No. 650, dated November 17, 1894; in Norway, No. 3,592, dated November 30,1894; in Italy, No. 35,821, dated March 21, 1894; in Sweden, No.

.5, 786, dated January 24, 1895; in Belgium, No.

108,701, dated March 15, 1894, and in South African Republic, No. (554, dated June 19, 1894.

My invention relates to improvements in percussion-drills, and is of special application to percussion-drills operated by means of an electromotor or other high-speed rotary mo tor; and the object of my invention is to provide a percussion-drill in which the power shall be transmitted from such rotary motor to the plunger in the most advantageous manner possible, and which shall be at the same time compact in form and easily transferable from place to place.

Referring to the drawings, Figure 1 is,a side elevation, partly in section, of my improved drill. Fig. 2 is a horizontal section, partly in plan, of the same; and Fig. 3 is a transverse vertical section on the line a: .90, Fig. 2.

Like letters refer to like parts in the several figures.

My improved drill consists of a suitable casing a, which is adapted to be moved longi tudinally by means of a feeding-screw I) working in the guide'rest b, adjustably secured to a suitable standard or column 0. Thecasing a is provided with bearings a, a at the front and rear ends of the machine, in which reciprocates the drill carrying plunger d. These bearings are placed as far apart as possible, so as to better withstand lateral strain upon the plunger and possible injuries therefrom in case of the drill-bit getting wedged fast in the rock. A special dust box or shield a is also provided for the front bearing, a, to prevent the entrance of dust or pulverized rock.

Power for. reciprocating the plunger dis derived from any suitable electromotor or other rotary motor (not shown) by means of the flexible shaft e, and is thence transferred to the shaft f carrying the fly-wheel f by any suitable gearing-as, for instance, by a pair of bevel-gears on the ends of the flexible shaft e and the shaft f, respectively. As, however, the apparatus for rotating the shaft f forms no part of my present invention, which is confined to the mechanism for actuating the plunger dfrom the shaft f, more detailed de 6 5 scription of this portion of the mechanism is deemed unnecessary. The shaft f carries a crank-arm f upon the end of which is a wristpin f held in a block g which slides in a transverse slot g in the traveler g so that the rotary motion of the shaft f will produce a reciprocatory movement in the traveler 9 if the latter be suitably guided. The traveler g carries at its rear end the arm h, which compasses the plunger d, and at the front end 7 5 of the traveler g is placed the cover-k, which also compasses the plunger and is secured to the arm h by upper and lower screw-bolts 7c 71" passing through extensions or lugs 10 70 of the cover 70 and arm h. These extensions on the traveler-arm and cover move in longi tudinal recesses provided in the casing a of the machine, and thus the traveler is guided in its movement of reciprocation. The movement of reciprocation. of the traveler g is transmitted to the plunger (Z by means of spiral springs Z Z, which surround the plunger and-abut at their outer ends against the cover is and arm h of the traveler, and at their inner ends against a ring or plunger m of the 0 sleeve m, which is fitted closely around the plunger and can turn on said plunger, but is prevented from longitudinal movement thereupon by the fixed rings m m on the plunger.

In order to make this system of springs work only by compressing them, (or, if a difierent construction is chosen, only by expanding them,) the tensions of the two springs are arranged to be such that when either is at its maximum tension the other has still a little tension left. The ring on of the sleeve at has extensions m m, similar to and which enter the same recesses as the extensions 70 70 and the sleeve m is thus prevented from turning. Thus the plunger d is capable of turning freely in the sleeve 772, while it receives therethrough from the springs Z Z the necessary reciprocatory movement. A step-by-step rotary movement of the plunger is necessary for the effective operation of a percussiondrill, and it is imparted to the plunger in a well -known manner by a device n. The plunger (Z is for this purpose cut with a screwthread of high pitch (indicated in the drawings near the device at.

\Vhile I have shown the sleeve m placed within the ends of the traveler 9 it is obvious that I might equally well arrange the traveler g actuated by the rotary movement of the shaft f, within the ends or extensions of an elongated sleeve secured to the plunger, springs being interposed between them in like manner in this construction as in the construction shown.

In United States Letters Patent No. 509, 373, issued November 28, 1893, to Carl IIoffmann, is shown a plunger having pitmen in the form of spiral springs imparting motion to the plunger in both directions from the revolution of the wrist-pin in a crank-arm; but in the machine there described the inner ends of the spiral springs were secured to and moved with the revolving wrist-pin. Thus these springs,

besides having their movement of contraction and expansion, were subjected to transverse vibration, which I now avoid. Moreover, my present invention permits of an arrangement in which the power is elastically transmitted to the plunger as nearly as possible in the line oflits work, in which the parts are most compactly arranged, the standard or support being close to the plunger-casing on one side and the driving or operating mechanism on the other side, and in which the latter can be readily detached and replaced when desired.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a reciprocating drill, the combination with the casing inclosing the plunger and provided with bearings at the ends, of a plunger reciprocating in said bearings, a collar mounted upon said plunger, a pair of covers or plates fitting loosely over said plunger and rigidly connected together, a pair of coiled springs, one situated between said eollar and each of said plates, a crank shaft mounted upon said casing extending perpendicular thereto, and carrying a crank pin engaging a slot in one of said plates, a fly wheel mounted upon the outer end of said crank shaft, and a flexible shaftconnected with a motor mounted independently of said casing, said flexible shaft being geared with said crank shaft to rotate the same; substantially as described.

2. In a reciprocating drill, the combination with a plunger, of a reciprocating slide, coiled springs encircling said plunger and connect ing the plunger with said slide, a crank shaft connected with said slide for reciprocating the same, a fly wheel mounted directly upon said crank shaft, and a flexible driving shaft for rotating said crank shaft; substantially as described.

In testimony whereof I have affixed my signature in the presence of two witnesses.

ADOLF EMIL \VALllllll'Alt MEISSNER. lVitnesses:

JOHN B. JACKSON, OSCAR KIELEFELD. 

